Area Forecast Discussion Issued by NWS Grand Forks, ND
000
FXUS63 KFGF 152340
AFDFGF
Area Forecast Discussion
National Weather Service Grand Forks ND
640 PM CDT Fri Mar 15 2024
.KEY MESSAGES...
- Critical fire weather conditions this afternoon and evening
for southeastern North Dakota and elevated concerns for west
central Minnesota.
- Strong winds this afternoon and evening for eastern North
Dakota into the Red River Valley. 60% chance for 45mph gusts
or higher. Strong winds again Saturday afternoon and evening,
with a 30% chance of seeing advisory level criteria.
&&
.DISCUSSION...
Issued at 214 PM CDT Fri Mar 15 2024
Upper level wave is moving through Manitoba, with a trailing cold
front shifting through the region today. An area of precipitation
associated with the upper level wave is currently moving north of
the International Border, with rain being the main precipitation
type. Temperatures will help dictate the evolution of the
precipitation as it moves through portions of the Red River Valley
and northwestern Minnesota later this afternoon and into the evening
hours. As the cold front approaches the area winds will start to
increase and temperatures drop allowing for the precipitation to
transition over to snow showers later this evening for northwestern
Minnesota. Winds are starting to increase already this afternoon,
with gusts nearing 35mph in the Devils Lake Basin. Continuing with
current wind advisory headlines along with Fire weather headlines.
Strong winds combined with RH values dropping into the lower 20s
this afternoon and evening increase the fire weather threat to
critical for southeastern North Dakota. Areas in west central
Minnesota will need to be watched as well, but conditions are likely
to be elevated for today.
We will continue to see a northwesterly flow aloft over the northern
plains through early next week helping to keep temperatures cooler.
Clusters are in agreement of this trend continuing, with a breakdown
of the troughing in the southwestern United States mid to late next
week. Mid to late next week indications are for a zonal to
southwesterly flow to set up. Each would indicate seasonal
temperatures, but differences in precipitation chances.
Southwesterly flow (25% chance of occurrence) would indicate
increased precipitation activity, while zonal (75% chance of
occurrence) would indicate chance for shortwaves out of Canada and
not as active.
Under the northwesterly flow we continue to see drier conditions,
with chances for precipitation. The upper level wave moving through
Manitoba into northwestern Minnesota brings the chance for rain to
northern Minnesota this afternoon through the evening, with a
transition to snow showers later this evening. We also increase our
winds as the cold front associated with the system moves through.
Winds have a 60% chance of exceeding 45mph for gusts within
northeastern North Dakota. Strong momentum transfers, modest cold air
advection, and strong lapse rates of 8-9 C/km help to bring down
strong 925mb winds through the weekend. The strongest winds will be
associated with the passage of the front this afternoon and evening.
Winds will continue to be strong overnight and into Saturday, but
slightly weaker. Gusts have a 30% chance of reaching advisory
criteria Saturday afternoon and evening when mixing is at its peak.
With the stronger winds and dry conditions in the area, fire weather
concerns increase. A Red Flag Warning is in effect through 8pm this
evening for southeastern North Dakota for critical fire weather
concerns. We have RH values dropping already into the lower 40s for
some areas in the southern Red River Valley. This trend will
continue, with Minimum RH values dropping to the lower 20s by mid to
late afternoon. Any fires that would develop will likely spread
rapidly under these conditions in south eastern North Dakota.
Moisture is higher in west central Minnesota, but still around the
20s for RH values. This prompts elevated fire weather concerns as
the strongest winds will be confined to the North Dakota side
within the Devils Lake Basin and northern Red River Valley. We will
continue to monitor the RH values and dry conditions for North
Dakota and Minnesota throughout today. RH values improve Saturday
afternoon and evening, with minimum RH values of the upper 30s to
lower 40s for the I-94 corridor points south.
Sunday will be the coldest day of the week, as a upper level wave
propagates through eastern North Dakota and western Minnesota.
Sunday afternoon will also be breezy, but with lower temperatures
relative humidity values will remain high enough to avoid fire
weather concerns. Northwest flow thereafter will maintain seasonal
temperatures through next week. A shortwave embedded in
northwesterly flow Wednesday night into Thursday brings a 20 percent
chance of minor winter impacts. There are significant disagreements
between ensembles of the track that this wave takes. This in turn
leads to uncertainty as to what type of impacts we could
receive.
&&
.AVIATION /00Z TAFS THROUGH 00Z SUNDAY/...
Issued at 640 PM CDT Fri Mar 15 2024
Light rain continues to work to the east this evening, with KTVF
and KBJI potentially seeing a window of opportunity for a shower
or two through late this evening. Winds will gradually shift
over the next several hours, becoming more northwesterly with
time. Gusts are expected to diminish slightly this evening, but
then increase once more heading into the overnight hours. VFR
ceilings prevail at all sites this evening, with MVFR CIGs
working into the area later this evening and into Saturday
morning.
&&
.FIRE WEATHER...
Issued at 214 PM CDT Fri Mar 15 2024
A Red Flag Warning is in effect through 8pm this evening for
southeastern North Dakota. Strong west winds, with gusts to 40mph
combined with dry fuels lead to critical fire weather concerns.
Lower winds and higher RH values in west central Minnesota prompt
elevated fire weather concerns instead of critical. Minimum RH
values this afternoon in southeastern North Dakota drop to the lower
20s. Improvements with RH values later this evening and into
tomorrow.
&&
.FGF WATCHES/WARNINGS/ADVISORIES...
ND...Wind Advisory until 9 PM CDT this evening for NDZ006>008-
014>016-024-026>029-038-054.
Red Flag Warning until 8 PM CDT this evening for NDZ038-039-
049-052-053.
MN...None.
&&
$$
DISCUSSION...Rafferty/Spender
AVIATION...Lynch
FIRE WEATHER...Spender